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Improving the Energy Storage Performance in Bi0.5Na0.5TiO3-Based Ceramics by Combining Relaxor and Antiferroelectric
Srinivas Pattipaka1, Yeseul Lim1, Yundong Jeong1
1Department of Materials Science and Engineering, Pukyong National University, 45, Yongso-ro, Nam-Gu, Busan 48513, Republic of Korea.
Materials (Basel, Switzerland)
|October 26, 2024
Summary
This study developed novel ceramic capacitors by combining relaxor and antiferroelectric properties in BNT-BT-SBT materials. The optimized ceramics achieve high energy density (1.02 J/cm³) and efficiency (75.98%) for advanced pulse power systems.
Area of Science:
- Materials Science
- Solid State Physics
- Ceramics Engineering
Background:
- Ceramic capacitors are crucial for pulse power systems due to fast charge-discharge, temperature stability, and fatigue resistance.
- Limitations in energy storage density and breakdown strength hinder practical applications of current ceramic capacitors.
- Developing advanced ceramic materials with enhanced energy storage is essential for next-generation technologies.
Purpose of the Study:
- To synthesize and characterize a series of relaxor ferroelectric ceramics, (1-x) [0.94 Bi0.5Na0.5TiO3 -0.06BaTiO3]- x Sr0.7Bi0.2TiO3 (BNT-BT-SBT).
- To investigate the effects of combining relaxor and antiferroelectric properties on energy storage performance.
- To optimize the composition for improved breakdown strength and energy density in ceramic capacitors.
Main Methods:
- Synthesis of BNT-BT-SBT ceramics with varying SBT content (x = 0 to 0.30).
- Characterization using X-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM).
- Electrical property measurements including dielectric constant, polarization-electric field (P-E) loops, breakdown strength, and energy storage density.
Main Results:
- XRD, Raman, and SEM revealed a rhombohedral-tetragonal phase, dynamic polar nanoregions, and reduced grain size with a dense microstructure.
- The optimal composition (x=0.275) exhibited a high dielectric constant (1654 at 1 kHz) and low remnant polarization (1.39 µC/cm²).
- A maximum recoverable energy density (W) of 1.02 J/cm³ and energy efficiency (η) of 75.98% were achieved at 89 kV/cm.
Conclusions:
- The incorporation of Sr-Bi-Ti-based (SBT) relaxor properties into BNT-BT ceramics enhances energy storage performance.
- The combination of relaxor and antiferroelectric properties, along with a fine-grained microstructure, leads to improved breakdown strength.
- BNT-based relaxor ferroelectric ceramics, particularly the optimized BNT-BT-SBT composition, show significant promise for next-generation high-performance ceramic capacitors.
